Chemistry - Halogen Derivative Question with Solution | TestHub

Hetrolytic cleavage of bond in each of the given compounds results in the formation of benzyl carbocation which is stabilised by resonance . The methoxy group at meta position in compound (III) destabilises the benzyl carbocation by-I effect where as methoxy group at ortho and para positions destabilises by-I effect and stabilises by +R effect . The stabilisation is stronger at the para position due to weak -I effect . Greater the stability of carbocation , lower is the bond dissociation energy ofbond.